Question 1

Why does a 50% loss need a 100% gain to recover?

Accepted Answer

Because percentages work off a shrinking base. Lose 50% of $1,000 and you have $500 — a 50% gain only brings you to $750. You need to double ($500 → $1,000), a 100% gain. This asymmetry is why avoiding deep drawdowns beats trying to trade out of them.

Question 2

How is recovery time estimated?

Accepted Answer

It solves how many compounding periods at your average return reach the required break-even gain: periods = ln(1/(1−drawdown)) ÷ ln(1+return). It assumes steady returns, so treat it as a best-case timeline — real recoveries stall and chop.

ドローダウン回復時間計算機

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